Apparatus for mixing gaseous fluids



Julie s,` 193o.

C. PRACHE APPARATUS FOR MIXING 'GASEOUS FLUIDS 2 Sheets-Sheei 1 Filed April 22, 1927 June 3,\1930.- c. PRACHE APPARATUS FOR MIXING GASEOUS FLUIDS Filed April 22, 1927 2 Sheets-Sheet 2 v a Patented 'June 3, 1,93%

,i UNTD sarai-Es PATENT oriPlCE CHARLES SPRACHE, 0E PARIS, FRANCE APPARATUS kFOR MXNG GASEOUS FLUIDS n Applicationled April 22, 1927, Serial No. 185,872, and in France March 29, 1927.

My inventionrelates to improvements in apparatus for mixing gaseous fluids of the v Y 1n]ectorcompressor type, 1n which a gaseous which are-designed' to-.produ'cea sucking inv and compression ofa gas or vapor by means of the kinetic energy of ajet of gas expanding in an appropriate recess.y ,Such apparatus' fluid for driving an engmei'or example, ris mixed with and carries along a second gase- -ous fluid. f n f p y f `My invention is comprised in certain novel forms', constructions, 4and combination of parts', the objects of which are to provide a reliable apparatus forthe purpose stated,all of which will hereinafter be fully described and claimed. Y f s Before proceeding with a detailed-descrip tiono'ii my-'apparatus it is well to briefly refer to the prior art lin order to better understand the yspecific objects of my invention. Numerous types of apparatus are knownin-the art v usually comprises essentially a convergingdiverging YpassagewayA 4having a contracted section of' elongatedrectangular Jform of small cross-section which opens into a diverg- Ving pipe pierced with openings designed-'to permit the gas to be mixed to be vdrawn in.

' In apparatus of this character the gaseous engine fluid passes throughv the recessl in the form'of a very thingaseous stream of great length and taking the Vshapeofa dihedral angle. This gaseous stream in penetrating a diverging expansion pipe attains great suc- 5 tion power and lpermits the gaseous liuid'to be mixed and carried along to be drawn in throughoriicesin said expansion pipe with a force proportional to the distance between said contracted section of the passageway and .46 said orifices. The kinetic energy of the mixture vthus formed Visthen transformed .into pressure in a chamber formed by a prolongation of the mixing or`r expansion pipe.v

, Itis well recognizedthat in apparatus of this character, that the particles of the gaseous motorv Huid can only expand in a'single direction, that is, in planes perpendicular to thev apex of the dihedral angle formed by the intersection of the two streams of fluid.v That such a condition in the operation of the ape paratus is undesirable is manifest.

. It will be noticed that the useful eiect of apparatus ot this character is directly influenced by the number of particles in the jet of gaseous motor fluid in the Zone of its periphery and consequently capable of coming into immediate contact with the gaseous fluid vide the contracted section into a series of circular sections of a diameter equal to the width of vthe Arectangular contracted section'and to arrange a plurality of mixing pipes to be ized by a common feed pipe and to discharge through an appropriate diffuser into a common collector pipe. f

Other objects of the invention will be obvious to those skilled in the art to which my invention appertains in the following speciflcatlion when taken in connection with the accompanying drawing, in which- Fig. l is a longitudinal sectional' view through the apparatus` forming my invention.

A F ig. 2 is an end elevational view of the apparatus shown in Fig. l, parts being in section.

Referring to the drawings, numeral 1 represents a conduit which conducts the gaseous y fluid to be mixed to the converging-diverging expansionv pipe 2 andin which the contracted the diverging secinclined to the extent desired with respect to 100 the axis of the expansion pipe 2.y These orifiees may be formed by superposing a plurality of circular rings 9 in the form of a truncated cone or in any otheisiutable manner.'V

TheV `mixing pipe 7 is .prolonged to form the conical section 10 whichV acts as a so-called diffuser `in which the mixture before leaving gradually loses its Vvelocity and acquires pressure." v Y y A number of mixing elements 11 of'this characterV are arranged in*4 groups with the uting pipe is closed at its lower extremity andA carries a circular section 13 at itsupperlex`r tremity. f .Y A :Each group of mixing tubes is fastened to the pipe. 12by vmeans of the =large 'conical base. ofthe 'mixing element. Each/of .the

four Grou s of mixin elementsthus formed is enclosed by casing 14 inthe form fof, a paralielepiped andwhose wallsextendtofthose of the square distributing pipe 12.r The four A casings when assembled form a cross of-.which Each casing lil is closed at itsvlowerfend by receives the` gaseous -ffluidto be mixediwith.y

through the pipeS} 17. f f i f The gaseous fluid-to'beinixedgandcarried along in the main'liuid isjbrought in through the vpipe isthe center. The .exterior'rwalls l5` of said casings carry .the small ends/'ofzt'h'e mixing elements 11 and into whichy said:

'q ing elements open, as yshown at 16.

A pipel gaseous motor fluid to themixing elementslll.

The fourpipes 17 are interconnected by'af feed pipe of cireularform .18 which'receives the motor iiuid through aninlet ypipe-19;

`means 'of a cover 20 and theuppen ends rare closed by a wall 21. :Couplings 22,-aref-:pro-v vided on walls21-wliich connect thecasings 14 witliaV circular distributing pipegZ-wliich theinotor fluid t irough-Aanf-inletpipe 24.' n The operation ofv my apparatus is as follows: Y

rllie vgaseous main or motorfluid isbrought to the feed pipe 18 through the inlet pipe 41.9 i y mixing elements Y v said `supply pipebeing common toeneo'f y y and feeds each group of tlie'inlet pipe24 and by means ofthe distributing pipe 23 and couplings 22 is fed to eachv of the casings Maud hence to tlieoriii'cesin the mixing elements. i .Y 1

The compressed mixture given ofi' by each diffuser of the mixingtubes iscollectediin tliey central pipe '12Jran5d' led ofthroughkthe i" i Us pipel.,v4 *Y y I y p c s Having thus described myinvention what I claim as new and desire to secure Let` ters Patent is-'v v Y .-1. In a device forV mixinggaseous fluids of the type vdescribed?a vcentral discharge con-f duit, a plurality of groups of .Venturi tubes I vopens into yeach ofthev casings through wall 15 and serves to `conductfthefluidrthroulgli said tubes tofentrain"andV produce a flow ,of said second'gaseous fluid. y 2. In a device for inixin'ggas'eous fluidsY of the type'describedya central discharge con-j duit, `a plurality ofgroups of Venturi mixing'tubes. radiating from said conduit and i .eaclihaving oiieaend remote .from the reso 'j stricted portion of said Venturi openf 'ing' into said conduitya supply pipe-into vwhich` the other `end of said mixing-.tubes open, said supplyfpipe being commonl to-said groups ofmixing tubes, 1means for'supplying saidsupply pipewith a` gaseousrfluid, acaslh` ing surrounding said mixing tubes, means for',V

supplying. said casingfwith 51a second-@gaseous fluid'anduneans linfzsaidtubes :for y causing! thein'ti-'odu-ction Vof Vsaid second fluid Y into said ftubes lwhen said lyiirst ..1 passes therethrough? 'I 3; in a device for kmixinggaseousyfluidsof. L j, i the f type" described, a Vcentral 1 diseliarge;oo'n-`r v duit, ajplurality Vof Venturi mi'xinggtubesirai- :dieting from andfopening intosaid conduit,

means commento said: mixing forsuipg plyingapgaseousfluid.tofsaidfmixinggtubes, c .Y and.y means; comniunicatingfwithsaid-Venturi vtubes" adjacent-the .restricted portions` thereof fory supplying a second gaseous fluid; to. said n tocause [one of theffluids; tobedrawn 1in bythe other through its kinetic energy raiidit'or subsequently' transforming said kinetic .y v

ergy r into pressure when :the *fluids jbecome, mixed. f f f 1 of the typer described,acentral-y discharge coning` tubes; radiating from and each having groups of said z mixing .tubesepem each of said .groups-fof mixing tubes,ineansffor -supplyingsaid -supplyfpipes with agaseous Iliuid, a casingsurrounding eachgroupfoffsaidmix-f ing`tubes,meansforsupplying `saidcasingkk .Y

with aseeond-gaseous fluidland means fin sai d' y.mixing tubes for causingoneoftlie .-liuidsf-to be drawn-in bythe other/through itslrinetic energy and fof SUbSequen-tly y transierining "icc tubes,saiduid supplying means cooperating'y said-kinetic energy'into'zpressurezwhenthe? f l yiiuidsbecorne mixed. i

`5. In. a `device for mix-ing. (gaseous fiuids fof the type d escribed,.a square dischargecon:

duit, a plural-ity of groups of mixing .cllevices` f y 'p for said conduit, 4there .bei-ng fone group yopening intoeach 'fp-aceof saidcenduiueach mixing device con-iprising/a,conefshapettubeJ y.a if? 1" converging-diverging orifice at the small end of said tubes for giving a gaseous fluid pass- Y ofv said orifices and making the same angle ywith the longitudinal axes of 4said tubes whereby thevelocity oi'A a gaseous fluid passingy through said orifices is diminished and Vits kinetic energy transformed into pressure means common to said mixing devices for supplying a gaseous fluid to said mixing devices throughvthe said converging-diverging orifice and means common to the openings in said tubes for supplying gaseous fluid to said mixing devices through said openings.

f6. In a device of the type described, a centrally disposed discharge pipe, a group of mixing pipes radiating from said discharge pipe and communicatingtherewith, an annu- Y lar supply pipe communicating with the other ends of said mixing pipes, a plurality of casings for said mixing pipes there being one fluid-tight casing for each group of mixing j pipes, said caslngs communicating With the interior of the mixing pipes enclosed thereby, a second annular supply pipe disposed on the upper Wall of said casings, a coupling interconnecting each ofy said casings With said second annular supply pipe and an inlet for said second supply pipe.

7. Ina device of the type described, a centrally disposed square dischargepipe, a group of mixing pipes extending from each surface of said discharge pipe, an annular supply pipe communicatingvvith the other ends of said mixing pipes, a plurality of casings for said mixing pipes there being one fluidtight casing foreach group of mixing pipes, a second annular supply pipe disposed on the upper Wall of said casings, a coupling interconnecting each of said casings With said second annular supply pipe, an inlet for said second supply pipe and means in said mixing pipes for causing one of the gaseous fluids supplied to apparatus to draw in a second gaseous fluid supplied to the apparatus by its kinetic energy and for subsequently transforming said kinetic energy into pressure when the fluids become mixed.

8. In a device of the type described, a centrally disposed dischargepipe, a group of mixing pipes extending from each surface of said discharge pipe, an annular supply pige'communicatingk With the other ends of said mixing pipes, each of said mixing pipes comprising a cone-shaped tube, a convergingdiverging orifice at the small ends of said tubes for giving a gaseous fluid passing therethrougha relatively high velocity, openings in said tube inclined With respect to the longitudinal axes of the tubes disposed adjacent the` diverging portions of said orifices the Walls of said tubes extending in the same direction as the dii/'erging portions of said orifices and making the same angles with the longitudinal axes of said orifices whereby the velocity ofia gaseous fluid passing through said tubes is diminished and its kinetic energy transformed into pressure, a plurality of casings for said mixing pipes there being one fluid-tight casing for each group of mixing pipes communicating With the pipes therein by means of said openings, a second annular supply pipe disposed on the upper Wall of said casings and a coupling interconnecting each of said casings With said second annular supply pipe.

In testimony whereof vI have affixedv my 

